package xyz.dengjunbo.framework.helper;

import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import xyz.dengjunbo.framework.util.CollectionUtil;
import xyz.dengjunbo.framework.util.PropsUtil;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * 数据库操作助手类
 */
public final class DataBaseHelper {
    private static final Logger LOGGER = LoggerFactory.getLogger(DataBaseHelper.class);
    private static final QueryRunner QUERY_RUNNER;
    private static final ThreadLocal<Connection>CONNECTION_HOLDER;
    private static final BasicDataSource DATA_SOURCE;

    static {
        CONNECTION_HOLDER = new ThreadLocal<>();
        QUERY_RUNNER = new QueryRunner();
        Properties conf = PropsUtil.loadProps("config.properties");
        String driver = conf.getProperty("jdbc.driver");
        String url = conf.getProperty("jdbc.url");
        String username = conf.getProperty("jdbc.username");
        String password = conf.getProperty("jdbc.password");

        DATA_SOURCE = new BasicDataSource();
        DATA_SOURCE.setDriverClassName(driver);
        DATA_SOURCE.setUrl(url);
        DATA_SOURCE.setUsername(username);
        DATA_SOURCE.setPassword(password);

    }
    /**
     * 获取数据库连接
     */
    public static Connection getConnection(){
        Connection connection = CONNECTION_HOLDER.get();
        if (connection == null) {
            try {
                connection = DATA_SOURCE.getConnection();
            } catch (SQLException e) {
                LOGGER.error("get connection failure", e);
            } finally {
                CONNECTION_HOLDER.set(connection);
            }
        }
        return connection;
    }
    /**
     * 关闭数据库连接
     */
//    public static void closeConnection(){
//        Connection connection = CONNECTION_HOLDER.get();
//        if (connection != null){
//            try {
//                connection.close();
//            }catch (SQLException e){
//                LOGGER.error("close connection failure",e);
//            }finally {
//                CONNECTION_HOLDER.remove();
//            }
//        }
//    }
    /**
     * 查询实体列表
     */
    public static <T> List<T> queryEntityList(Class<T> entityClass,String sql,Object... params){
        List<T>entityList;
        try {
            Connection connection = getConnection();
            entityList = QUERY_RUNNER.query(connection,sql,new BeanListHandler<T>(entityClass),params);
        }catch (SQLException e){
            LOGGER.error("query entity list failure",e);
            throw new RuntimeException(e);
        }
        return entityList;
    }
    /**
     * 查询实体
     */
    public static  <T> T queryEntity(Class<T>entityClass,String sql,Object...params){
        T entity;
        try {
            Connection connection = getConnection();
            entity = QUERY_RUNNER.query(connection,sql,new BeanHandler<T>(entityClass),params);
        }catch (SQLException e){
            LOGGER.error("query entity failure",e);
            throw new RuntimeException(e);
        }
        return entity;
    }
    /**
     * 插入实体
     */
    public static <T> boolean insertEntity(Class<T>entityClass,Map<String,Object>fieldMap){
        if (CollectionUtil.isEmpty(fieldMap)){
            LOGGER.error("can not insert entity:fieldMap is empty");
            return false;
        }
        String sql = "INSERT INTO "+getTableName(entityClass);
        StringBuilder columns = new StringBuilder("(");
        StringBuilder values = new StringBuilder("(");
        for (String fieldName:fieldMap.keySet()){
            columns.append(fieldName).append(", ");
            values.append("?, ");
        }
        columns.replace(columns.lastIndexOf(", "),columns.length(),")");
        values.replace(values.lastIndexOf(", "),values.length(),")");
        sql += columns + " VALUES " + values;

        Object[] params = fieldMap.values().toArray();
        return executeUpdate(sql,params) == 1;
    }

    /**
     * 更新实体
     */
    public static <T> boolean updateEntity(Class<T>entityClass,long id,Map<String,Object>fieldMap){
        if (CollectionUtil.isEmpty(fieldMap)){
            LOGGER.error("can not update entity:fieldMap is empty");
            return false;
        }
        String sql = "UPDATE "+getTableName(entityClass)+" SET ";
        StringBuilder columns = new StringBuilder();
        for(String fieldName : fieldMap.keySet()){
            columns.append(fieldName).append("=?, ");
        }
        sql+=columns.substring(0,columns.lastIndexOf(", "))+" WHERE id =?";
        List<Object>paramList = new ArrayList<Object>();
        paramList.addAll(fieldMap.values());
        paramList.add(id);
        Object[] params = paramList.toArray();
        return executeUpdate(sql,params) == 1;
    }

    /**
     *删除实体
     */
    public static <T> boolean deleteEntity(Class<T> entityClass,long id){
        String sql = "DELETE FROM "+getTableName(entityClass)+" WHERE id = ?";
        return executeUpdate(sql,id)==1;
    }
    private static  String getTableName(Class<?> entityClass) {
        return entityClass.getSimpleName();
    }

    /**
     * 执行查询语句
     */
    public static List<Map<String,Object>>executeQuery(String sql,Object...params){
        List<Map<String,Object>>result;
        try {
            Connection connection = getConnection();
            result = QUERY_RUNNER.query(connection,sql,new MapListHandler(),params);
        }catch (Exception e){
            LOGGER.error("execute query failure",e);
            throw new RuntimeException(e);
        }
        return result;
    }
    /**
     * 执行更新语句（包括update,insert,delete）
     */
    public static int executeUpdate(String sql,Object...params){
        int rows = 0;
        try {
            Connection connection = getConnection();
            rows = QUERY_RUNNER.update(connection,sql,params);
        }catch (SQLException e){
            LOGGER.error("execute update failure",e);
            throw new RuntimeException(e);
        }
        return rows;
    }
    /**
     * 执行sql文件
     */
    public static void executeSqlFile(String filePath){
        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(filePath);
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        try {
            String sql;
            while ((sql=reader.readLine()) != null){
                executeUpdate(sql);
            }
        }catch (Exception e){
            LOGGER.error("execute sql file failure",e);
            throw new RuntimeException(e);
        }
    }
    /**
     * 开启事务
     */
    public static void beginTransaction(){
        Connection conn = getConnection();
        if (conn != null){
            try {
                conn.setAutoCommit(false);
            }catch (SQLException e){
                LOGGER.error("begin transaction failure",e);
                throw new RuntimeException(e);
            }finally {
                CONNECTION_HOLDER.set(conn);
            }
        }
    }
    /**
     * 提交事务
     */
    public static void commitTransaction(){
         Connection conn = getConnection();
         if (conn != null){
             try {
                 conn.commit();
                 conn.close();
             }catch (SQLException e){
                 LOGGER.error("commit transaction failure",e);
                 throw new RuntimeException(e);
             }finally {
                 CONNECTION_HOLDER.remove();
             }
         }
    }
    /**
     * 回滚事务
     */
    public static void rollbackTransaction(){
        Connection conn = getConnection();
        if (conn != null){
            try {
                conn.rollback();
                conn.close();
            }catch (SQLException e){
                LOGGER.error("rollback transaction failure",e);
                throw new RuntimeException(e);
            }finally {
                CONNECTION_HOLDER.remove();
            }
        }
    }
}
